Barack Obama has prospered in this presidential campaign because of the steadiness of his temperament and the judicious quality of his decision-making. They are his best-known qualities. The most important decision he has made — the selection of a running mate — was done carefully, with an exhaustive attention to detail and contemplation of all the possible angles. Two months later, as John McCain's peremptory selection of Governor Sarah Palin has come to seem a liability, it could be argued that Obama's quiet selection of Joe Biden defined the public's choice in the general-election campaign.
But not every decision can be made so carefully. There are a thousand instinctive, instantaneous decisions that a presidential candidate has to make in the course of a campaign — like whether to speak his mind to a General Petraeus — and this has been a more difficult journey for Obama, since he's far more comfortable when he's able to think things through. "He has learned to trust his gut," an Obama adviser told me. "He wasn't so confident in his instincts last year. It's been the biggest change I've seen in him."
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